It has now been 20 years since the release of The Princess Diaries 2: Royal Engagement, and a third installment, The Princess Diaries 3, has been announced. Although there is a lot of excitement surrounding the highly anticipated third film, it remains to be seen what The Princess Diaries 3‘s story will be. The threequel has many interesting possibilities to explore, one of which would be having a new character be the “Mia” of the story.